Motion - Netcam Code Overview

Netcam Code Overview

The Camera Thread Side

The netcam code is initiated from video.c function vid_start() by calling the function
  • netcam_start(cnt)

Each video frame is fetched from video.c function vid_next() by calling function
  • ret = netcam_next(cnt, map);

where ret is the same pointer as map pointing to the buffer containing the video frame

Netcam context struct

Defined in motion.h

struct netcam_context Description
pthread_t thread  
pthread_attr_t thread_attr  
pthread_mutex_t mutex  
int threadnr  
int state  
struct rbuf *response  
struct url_t url  
char *userpass  
char *boundary  
struct netcam_caps int streaming 1 - supported
0 - unsupported
int contentlength 1 - supported
0 - unsupported
int which  
pthread_cond_t which_cond  
pthread_cond_t dirty_cond  
struct netcam_image image[2] pthread_mutex_t mutex  
struct netcam_image_buffer buffer char *ptr  
size_t size  
size_t used  
int dirty  
int (*read)(struct context *)  

The Netcam Thread Side - netcam_start(cnt)

  • Report to console and syslog that netcam is starting IF setup_mode
  • Reserve memory for a netcam contect struct called cnt->netcam with local pointer name netcam
  • Parse the URL given in cnt->conf.netcam_url (config option). Put result in netcam->url which is a struct type url_t.
    • parse_url->service = http
    • parse_url->userpass = username:password
    • parse_url->port = port number
    • parse_url->path = path on the server
  • Initialize these mutexes ALERT! insert what each is used for when you find out
    • netcam->mutex
    • netcam->image[0].mutex
    • netcam->image[1].mutex
    • netcam->which_cond
    • netcam->dirty_cond
  • Initialize more netcam struct variables

Topic not finished. I take a little at a time

-- KennethLavrsen - 26 May 2005
Topic revision: r4 - 26 Jun 2005, KennethLavrsen
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